Audio/Video chat is the “next” big thing and a lot of people use Skype already to get that functionality on Linux without much hazzle (certainly a few use Ekiga aswell).
Just recently the popular instant messenger Pidgin joined the ranks with their 2.6 release which introduced A/V chat for Jabber (XMPP) users.
However, finally it looks like there will be a decent way on Linux to have A/V chat with the very popular MSN protocol!
Apart from that he mentions that file transfer and offline messaging support is also done and being merged.
Total awesomeness on the internets.
Telepathy/Empathy is part of the next GNOME Desktop release thus these changes are expected to hit the next cycle of distribution releases.